Single Phase Transformer

Which of the following does not change in an ordinary transformer........

• Frequency

• Voltage

• Current

• Any of the above

Transformer cores are laminated in order to.......

• Minimise eddy current loss

• Reduce cost

• Simplify its construction

• Reduce hysteresis loss

A step-up transformer increases........

• Power

• Current

• Voltage

• Frequency

A transformer transform........

• Voltage

• Current

• Frequency

• Voltage and current

Which of the following is not a basic element of transformer?........

• Core

• Primary Winding

• Secondary Winding

• Mutual Flux

What will happen if the primary of a transformer is connected to D.C supply?

• Transformer will operate with low efficiency

• Transformer will operate with high efficiency

• Transformer may start to smoke and burn

• No effect

E.M.F Equation of the Transformer is _________.

• E1 = 4.44 f N1 Øm , E2=4.44 f N2 Øm

• E1= 4.44 f N1 Bm A , E2 = 4.44 f N2 BmA

• E1= 4.44 N1 Øm/T , E2=4.44 N2 Øm/T

• All of the above

• None of the above

A Transformer______________.

• Changes ac to DC

• Changes dc to AC

• Steps up or down DC Voltages & Current

• Steps up or down AC Voltages & Current

Transformer is a device which:________________.

• Transfer Electrical power from one electrical circuit to another Electrical circuit

• It’s working without changing the frequency

• Work through on electric induction.

• When, both circuits take effect of mutual induction

• All of the above

For a transformer with number of secondary windings more than the number of primary windings, the secondary current will be _____________ ?

• More than the primary current

• Less than the primary current

• Equal to the primary current

• Zero